Usage:
No current usage.
(†Grassy Ridge formation (informal) (ID,OR-recognized locally between Wallowa Mountains of northeastern OR and Seven Devils Mountains of western ID) considered discarded.)
Geologic age:
Middle Triassic
Type section, locality, area and/or origin of name:
[Probably named from exposures on west side of Grassy Ridge, Snake River Canyon, Adams Co., western ID.]
AAPG geologic province:
Eastern Columbia basin
Idaho Mountains province
Snake River basin
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).